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  • Title: Effect of vitamin D therapy on bone turnover markers in postmenopausal women with osteoporosis and osteopenia.
    Author: Tanzy ME, Camacho PM.
    Journal: Endocr Pract; 2011; 17(6):873-9. PubMed ID: 21550960.
    Abstract:
    OBJECTIVE: To (1) assess the rate of reduction in bone turnover with vitamin D and bisphosphonate therapies and (2) evaluate the clinical utility of bone-specific alkaline phosphatase (BSAP) in monitoring treatment response. METHODS: We retrospectively reviewed medical records of patients with newly diagnosed osteopenia and osteoporosis from 2002 to 2009 at Loyola University Medical Center. A cohort of postmenopausal women with hip or spine T-scores of less than -1, normal serum creatinine, and no prior vitamin D or bisphosphonate therapy was divided into vitamin D-deficient (n = 29) and vitamin D-sufficient (n = 13) groups. Vitamin D-deficient patients received high-dose vitamin D, whereas vitamin D-sufficient patients received orally administered bisphosphonates. BSAP levels at baseline and 1 year were compared. RESULTS: Vitamin D therapy in the group with vitamin D deficiency led to a 26.7% decrease in BSAP (P<.01). Bisphosphonate therapy in the vitamin D-sufficient group led to a 32.7% decrease in BSAP (P = .01). The magnitude of BSAP change in the 2 study groups (6.74 ± 6.48 μg/L and 8.72 ± 9.94 μg/L) did not differ significantly (P = .45). CONCLUSION: The results of this study suggest that correction of vitamin D deficiency in patients with osteopenia and osteoporosis can lead to a decrease in bone turnover as measured by BSAP and that the magnitude of this reduction is similar to that achieved with orally administered bisphosphonates.
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